Highly Efficient Van Der Waals Heterojunction on Graphdiyne toward the High‐Performance Photodetector

• Published in: Advanced science Vol. 10; no. 25; pp. e2300925 - n/a
• Main Authors: Do, Dinh Phuc, Hong, Chengyun, Bui, Viet Q, Pham, Thi Hue, Seo, Sohyeon, Do, Van Dam, Phan, Thanh Luan, Tran, Kim My, Haldar, Surajit, Ahn, Byung‐wook, Lim, Seong Chu, Yu, Woo Jong, Kim, Seong‐Gon, Kim, Ji‐Hee, Lee, Hyoyoung
• Format: Journal Article
• Language: English
• Published: Germany John Wiley & Sons, Inc 01.09.2023; John Wiley and Sons Inc; Wiley
• Subjects: broadband detection; Chemical vapor deposition; Efficiency; fast response; Fourier transforms; graphdiyne; Graphene; high responsivity; highly effective heterojunction; Hydrocarbons; MoS2; Scanning electron microscopy; Spectrum analysis; Thin films; highly effective heterojunction; graphdiyne; fast response; high responsivity; broadband detection; MoS2
• ISSN: 2198-3844; 2198-3844
• DOI: 10.1002/advs.202300925

Graphdiyne (GDY), a new 2D material, has recently proven excellent performance in photodetector applications due to its direct bandgap and high mobility. Different from the zero‐gap of graphene, these preeminent properties made GDY emerge as a rising star for solving the bottleneck of graphene‐based inefficient heterojunction. Herein, a highly effective graphdiyne/molybdenum (GDY/MoS2) type‐II heterojunction in a charge separation is reported toward a high‐performance photodetector. Characterized by robust electron repulsion of alkyne‐rich skeleton, the GDY based junction facilitates the effective electron–hole pairs separation and transfer. This results in significant suppression of Auger recombination up to six times at the GDY/MoS2 interface compared with the pristine materials owing to an ultrafast hot hole transfer from MoS2 to GDY. GDY/MoS2 device demonstrates notable photovoltaic behavior with a short‐circuit current of −1.3 × 10−5 A and a large open‐circuit voltage of 0.23 V under visible irradiation. As a positive‐charge‐attracting magnet, under illumination, alkyne‐rich framework induces positive photogating effect on the neighboring MoS2, further enhancing photocurrent. Consequently, the device exhibits broadband detection (453–1064 nm) with a maximum responsivity of 78.5 A W−1 and a high speed of 50 µs. Results open up a new promising strategy using GDY toward effective junction for future optoelectronic applications. Here, for the first time, a highly effective graphdiyne/molybdenum (GDY/MoS2) type‐II heterojunction in a charge separation is reported toward a high‐performance photodetector. The device exhibits broadband detection (453–1064 nm) with a maximum responsivity of 78.5 A W−1 and a high speed of 50 µs.